Anomalous Doping Variation of the Nodal Low-Energy Feature of Superconducting (Bi,Pb)2(Sr,La)2CuO6+δ Crystals Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy
Takeshi Kondo, Y. Nakashima, W. Malaeb, Y. Ishida, Y. Hamaya, Tsunehiro Takeuchi, S. Shin
DOI 10.1103/PhysRevLett.110.217006 · Physical Review Letters
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Abstract
The nodal band dispersion in (Bi,Pb)2(Sr,La)2CuO6+δ (Bi2201) is investigated over a wide range of doping by using 7-eV laser-based angle-resolved photoemission spectroscopy. We find that the low-energy band renormalization (“kink”), recently discovered in Bi2Sr2CaCu2O8+δ (Bi2212), also occurs in Bi2201, but at a binding energy around half that in Bi2212. Surprisingly, the coupling energy dramatically increases with a decrease of carrier concentration, showing a sharp enhancement across the optimal doping. These properties (material and doping dependence of the coupling energy) demonstrate the significant correlation among the mode coupling, the energy gap close to the node, and the strong electron correlation. Our results suggest forward scattering arising from the interplay between the electrons and in-plane polarized acoustic phonon branch as the origin of the low-energy renormalization.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| (Bi,Pb)2(Sr,La)2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| (Bi,Pb)2(Sr,La)2CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | unknown |
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